Unanswered: Application performance

Hello ,

At the moment, I design an application with sencha touch 2.1.
My buttons don't work correctly. When I tap slowly on a button , it works correctly but if I tap normaly on the button it doesn't works every time however I can see that the button is pressed.
So I thing my application isn't optimized correctly but I don't see why, because I have followed the Sencha's advices to optimise an application

You can improve....

Depending how your app is structured (how is it structured by the way? Do you have a tabpanel?) you should be able to remove the DOM items that are not visible and it will speed up your app significantly. try that command after clicking around, you might find the number is even higher.

I had a very heavy tabpanel based app, and performance improved more than 2x after I removed non-visible DOM items

Thank you for your quick answer.
In fact, on the Ipad I have never more than 360 items into the DOM.
I created a new view and I put a simple container with a button in order to test. I marked it in initial view and started my application on my Ipad. And I have the same problem the button works only if I press it slowly.
However, if I tap quickly it doesn't work but the button is pressed.